Centering device for pistons



Jul 26, 1927. ,91 7 'K. F. M JILTON CENTERING DEVICE FOR PISTONS I i A 10. 1926 2 Sheets-Sheet l,

Patented July 26, 1927.

UNITED STATES 1,636,918 PA NT OFFICE.

KARL I. mansion, on monnnnxnrssoum.

GENTERING DEVICE on PISTON-S.

Application filed August 10, 1926. s erial No. 128,497.

This invention has reference to a device designed to facilitate the recentering of pump pistons, the primary object of the invention being to provide means for supporting the piston'while it is being treated.

An important object of the invention is to provide novel means for holding the piston, the means for holding the piston being of a construction whereby the same may be applied without the necessity of removing the usual plate carried by the piston of a particular type of pump.

A still further object of the invention is the provision of means for securely fastening the removable centering device to the piston under treatment.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawings:

Figure 1 is a plan view of a centering de- 550 vice constructed in accordance with the invention.

Figure 2 is an elevational view illustrating the various parts of the movable center, as disconnected.

I Figure 3 is a fragmental sectional view through the centering device.

Figure 4 is an elevational view of the usual piston disk or plate.

Figure 5 is a vertical sectional View through the movable centering device.

Figure 6 is a rear elevational view thereof.

Referring to the drawings in detail, the device includes a stationary center 5 and a movable center 6 between which the pump piston to be treated, is supported.

A piston such as indicated at 7 and having an integral stem is of the type for which the device forming the essence of the pres ent invention is particularly designed, and as shown, the piston is provided with the usual disk or plate 8 which is secured to the piston by means of the rivets 9, the present device being designed for supporting a piston of this character without the necessity of removing the disk or plate 8. The piston is of the well known construction and is provided with a cut out portion such as indicated at 10, and over which cut out portion the disk or plate 8 is positioned, the plate being shown as having a key-hole opening 9' for the reception of the head 11 of the securing bolt employed for securing the centering member 12 to the plate 7, the securing bolt being indicated at 13.

This head 11 is clearly shown by Figur 2 of the drawing and embodies a lateral offset portion formed with a shoulder 18 which engages the inner surface of the plate or disk 8 to clamp themembers 8 and 12 together. A threaded opening His provided in the movable centering member and receives the threaded member 15 of the bolt 13, and at the same time the member 12 cooperates with the head 11 to clamp the plate 8. Formed in one end of the member 12 is an opening in which the shiftable bearing member 16 forming a part of the movable center, is positioned, the movable center being provided with depressions to receive the inner ends of the set screws 17 so that the movable bearing 16 may be adjusted within the cut out portion.

From the foregoing it will be obvious that due to, this construction, whenit is designed to recenter a piston of the type described, and as shown by the drawings, it is unnecessary to remove the usual plate or disk 8 which is carried by the piston, and it isonly necessary to insert the head 11 in the keyhole opening 9 and move the same in a clockwise or anti-clockwise direction, whereupon the member 12 may be screwed onto the threaded portion 15 of the bolt 13, whereupon the device is securely clamped in position.

Should it be desired to move the bearing member 16 to insure a true centering of the piston, the set screws 17 may be operated to move the bearing member 16 to its proper aligning position.

I claim:

1. In a device of the character described, a stationary center and a movable center for supporting a pump piston under treatment, said piston having aplate secured thereto, said plate and piston having openings, the opening in the plate being of the key-hole type, a removable bearing supporting member having a threaded opening, a bolt having an elongated head, positioned in the threaded openin of the bearing supporting member, said cad adapted to be positioned in the key-holeopening and twisted to lockithe bolt and bearing supporting member to the piston, and an adjustable bearing member mounted in the bearing supporting member to be engaged by themovable center.

2. In a device of the character described, a stationary center and a movable center for supporting a pump piston, a bolt forming a part of the movable center and having a latveral offset head defining a shoulder, and 10 means adapted'to be clamped to a pump p1s- Intestimony that I claim the foregoing as 15 my own, I have hereto affixed my signature.

KARL F. MOJILTON. 

